Party-line telephone system.



No. 799,887. PATENTED SEPT. 19, 1905. S. M. GANT, DEGD.

M. A. BREADHEIT, EXEGUTRIX.

PARTY LINE TELEPHONE SYSTEM.

APPLICATION FILED FEB. 24, 1903'. RENEWED FEB. 16.1905.

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m. A. BBBADHEIT, BXEOUTRIX.

PARTY LINE TELEPHONE SYSTEM.

APPLIOATION FILED T11R24, 1903. RENEWED FEB. 16. 1905.

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No. 799,887. PATENTBD SEPT. 19, 1905. S. M. GANT, DEGD.

M. A. BEEADHEPT, EXEGUTRIX.

PARTY LINE TELEPHONE SYSTEM. APPLICATION FILED FEB. 24. 1903. RENEWED FEB. 16.1905.

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I] No: wags APPLICATION FILED FEB. 24, 1903. RENEWED FEB. 16.1905

PATENTED SEPT. 19, 1905.

S. M. GANT, DEGD.

M. A. BREADHEPT, EXEGUTRIK.

PARTY LINE TELEPHONE SYSTEM.

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No. 799,887. PATENTED SEPT. 19, 1905.

S. M. GANT, DECD.

M. A. BREADHEIT, EXBOUTRIX.

. PARTY LINE TELEPHONE SYSTEM. APPLICATION FILED FEB. 24, 1903. RENEWED FEB. 16.1905.

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No. 799,887. A PATENTED SEPT. 19, 1905.

S. M. GANT, DEOD.

M. A. BREADHBFT, EXEGUTRIX. PARTY LINE TELEPHONE SYSTEM.

APPLICATION FILED PERM, 1903. RENEWED FEB. 16.1905.

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S. M. GANT, DBOD. M. A. BREADHBFT, BXECUTRIX.

PARTY LINE TELEPHONE SYSTEM.

APPLICATION FILED FEB. 24, 1903. RENEWED FEB. 16.1905.

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No. 799,887. PATENTBD SEPT. 19, 1905.

s. M. GANT, DEGD.

H. A. BREADHEFT, EXEOUTRIX.

PARTY LINE TELEPHONE SYSTEM. urmanxox I'ILED 113x24. 190s RENEWED man. 16.1905.

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M. A. BREADHEFT EXEGUTRIX.

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,PARTY LINE TELEPHONE SYSTEM. APPLICATION FILED FEB. 24, 1903. RENEWED FEB. 10.1905.

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S. M. GANT, DEGD. M. A. BREADHEFT, EXEOUTEIX.

PARTY LINE TELEPHONE SYSTEM.

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I (Jqivmtoz 29991499999 I S. wjwdeca UNITED STATES PATENT OFFICE.

MARY A. BREADHEFT, OF INDIANAPOLIS, INDIANA, EXECUTRIX OF SAMUEL MARTIN GANT, DECEASED, ASSIGNOR TO SARA 0. WILSON.

PARTY-LINE TELEPHONE SYSTEM.

Specification of Letters Patent.

Patented Sept. 19, 1905.

Application filed FebrnaryZ L, 1903. Renewed February 16,1905. Serial No. 245,875.-

To a whom it TH/(ty concern.-

Be it known that I, MARY A. BREADHEFT, executrix, a citizen of the United States, residing at Indianapolis, in the county of Marion, State of Indiana, am in possession of an invention in certain new and useful Improvements in Party-Line Telephone Systems, invented by SAMUEL MARTIN GANT, deceased, of which the following is a specification.

In the present system of telephonic communication'a continuous current is used for the talking-circuit and an alternating current is used for the ringing-circuit.

The object of the present invention is to provide a mechanism by which these two currents may be utilized and controlled by central to cut out all but a particular one of a number of party-line phones at any particular time in order that, so far as bell-ringing and secrecy of conversation is concerned, the party-line service becomes equal to an individual-line service, the arrangement being such that no party other than the one predetermined by central may cut in.

The accompanying drawings illustrate the invention.

Figure 1 is a diagrammatic illustration of the apparatus for a two-party line, the parts being shown in normal position. Figs. 2, 3, A, 5, 6, 7, and 8 indicate the successive steps in the apparatus preliminary to cutting out phone Y. Fig. 9 is a similar view showing the parts in condition for ringing the bell of phone X and for permitting conversation thereover without permitting conversation over phone Y. Figs. 10, 11, 12, 13, 14:, 15, and 16 show subsequent steps preliminary to cutting out phone X and cutting in phone Y. Fig. 17 is a similar view showing the parts in position for use of phone Y. Fig. 18 is a diagram of the wiring for a three-phone group, showing the method of adding additional instruments to the main line.

The subcentral apparatus is composed of a plurality of relays or circuit-changers arranged in two sets, one set. to be affected by the alternating current and those of the other set to be affected by the direct current, or, stated more broadly, the circuit-changers of one set to be afiected by a current through one circuitwhile the circuit-changers of the other set are to be affected by a current through anothercircuit. If desired, the circuit-changers to be affected by the alternating current may consist of a suitable coil, within which is pivoted an armature which forms the core for a coil connected either in series or in parallel with the surrounding coil, the said arm carrying a suitable finger to operate the terminals and being yieldingly held in one position by a suitable spring. The changers to be affected by direct current may be similar to the other changers except that a polarized armature may be used.

With these units the apparatus at subcentral for a two-party line is composed of wound circuit-changers A, B, C, D, E, K, and M, and unwound or polarized circuit-changers F, Gr, H, I, J, and L.

" The main-line wires of the system are indicated at 33 and 34, line 33 serving as a leading-in wire for both circuits and connected by wire 35 with binding-post 36 of the subcentral apparatus. Binding-post 37 of this apparatus is grounded through a switch 0, and a binding-post 38 is connected through a switch a and wire 198 with the wire 34. Connected with binding-post 36 is a bus-bar 39. Connected with binding-post 3.8 is a bus-bar 40, a magnet-coil N forming part thereof, and connected to binding-post 37 is abus-bar 4:1. Bus-bars 42 and 43 are also provided for a purpose which will appear. The coil of changer A is connected to one side of a condenser 44 by a wire 15, and the opposite side of said condenser is connected by a Wire 4'6 to bus-bar 39, while a wire 47 connects wire and bus-bar 4:2.

ChangerA is provided with a spring-terminal 18, adapted to be engaged by the insulatinghead of the armature thereof and thrown into engagement with a stationary terminal A9.

Changer B is provided with a pair of companion spring-terminals 50 and 51 and coop crating stationary terminals 52 and 53, respectively. Changer B is also provided with a third spring-terminal 54:, cooperating with a stationary terminal 55, the arrangement being such that when the insulating-head of the armature is in engagement with the companion termipals 50 and 51 it will not engage the terminal 54:, and vice versa. The normal posi tion of the armature'of changer B is such as to hold terminals 50 and 51 into engagement with their cooperating terminals 52 and 53, respectively.

Changer C is provided with a pair of companion terminals 56 and 57, which cooperate with stationary terminals 58 and 59, respectively, the normal position of the armature of changer C being out of engagement with the spring-terminals 56 and 57.

Changer D is provided with a pair of companion terminals 60 and 61, which coiperate with stationary terminals 62 and 63, and is also provided with an opposed spring-terminal 64, cooperating with a stationary terminal 65, the normal position of the armature of changer D being such as to throw terminal 64 into contact with terminal 65.

Changer E is provided with a spring-terminal 66, cooperating with a stationary terminal 67, the said spring-terminal being normally engaged by the armature, and is also provided with a spring 68, opposed to spring-terminal 66, and said spring-terminal 68 cooperating with a stationary terminal 69.

Changer F is provided with a spring-terminal 70,normally engaged by the armature and held in contact with a stationary terminal 71. Changer F is also provided with a pair of companion spring-terminals 72 and 73, which cooperate with stationary terminals 74 and 75, respectively.

Changer G is provided with a spring-terminal 76, normally held in contact with a stationary terminal 77, and is also provided with a pair of companion terminals 78 and 79, normally out of contact with stationary terminals 80 and 81, respectively.

Changer H is provided with a terminal 82, normally held in contact with stationary terminal 83, and is also provided with a pair of companion spring-terminals 84 and 85, normall y out of contact with stationary terminals 86 and 87, respectively.

Changer I is provided with a single springterminal 88, normally out of contact with stationary terminal 89.

Changer J is provided with a pair of companion spring-terminals 90 and 91, normally out of contact with stationary terminals 92 and 93, respectively.

Changer K is provided with a spring-terminal 94, normally held by the armature in contact with a stationary terminal 95, and is also provided with a pair of companion terminals 96 and 97, normally out of contact with stationary terminals 98 and 99, respectively.

Changer L is provided With a pair of companion terminals 100 and 101, normally out of contact with stationary terminals 102 and 103, respectively.

Changer M is provided with a spring-terminal 104, normallyheld in contact with stationary terminal 105, and is also provided with a pair of companion spring-terminals 106 and 107, normally out of contact with stationary terminals 108 and 109, respectively.

Located in the-bus-bar 40, so as to serve as a shunt for alternating currents around the coil of magnet N, is a condenser 110. Magnet N has an armature 111, which connects and serves to operate spring-terminals 112 and 113, one of such terminals being provided for each phone of the party and cooperating with stationary terminals 114 and 115, respectively.

Mounted in phone X is a polarized changer O, which is provided with a spring-terminal 116, normally held by the armature in engagement with a stationary terminal 117, and is also provided with a pair of spring-terminals 118 and 119, normally out of engagement with stationary terminals 120 and 121. Similarly, phone Y is provided with a polarized changer P, provided with a spring-terminal 122, normally in contact with stationary terminal-122, and with a pair of companion terminals 123 and 124, normally out of contact with stationary terminals 125 and 126.

As has been previously stated, one end of the coil of changer A is connected by wire 45 with one side of the condenser 44. The opposite end of the armature-coil of A is connected by a wire 127 with spring-terminal 51.

Terminal 52 is connected by a wire 132 with bus-bar 40. Terminal 53 is connected by Wire 128 to bus-bar 41. Terminal 55 is connected by a wire 129 with one end of the coil of B, while wire 130 connects the opposite end of the armature-coil of B with busbar 43. Terminal 55 is also connected by wire 131 with terminal 75. Terminal 56 is connected by wire 133 with bus-bar 43 and is also connected by a wire 134 with terminal 79. Terminals 58 and 81 are connected with each other and with one end of the coil of C by wire 135. Terminal 57 is connected by wire 136 with terminal 91 and also with one end of the coil of J. Terminals 59 and 84 are connected by a wire 137, said wire also connecting with one end of the coil of H, the opposite end of said coil being connected by wire 138 with busbar 40. The opposite end of the armature-coil of C is connected by wire 139 with terminal 64, and terminal 65 is connected by wire 140 with bus-bar 41. Terminals 62 and 87 are connected together and to one end of the armature-coil of D by a wire 141, while the opposite end of the coil of D is connected by a wire 142 with terminal 66. Terminal 67 is connected by a wire 143 with one end of the coil of E and also with bus-bar 41. The opposite end of the armature-coil of E is connected by a wire 144 with terminals 69 and 89. Terminals 68 and 88 are connected together and to bus-bar 43 by a wire 145. Terminal 63 is connected by a wire 146 with one end of the coil of I, While the oppo- 

